Colored Skulls

These colored skulls are far more than just a simple homage to the Halo franchise's skulls; they actually unlock very special Developer Mods that can be used to create very expensive but super uber weapons.

There are five Colored Skulls that can be found on the island and which must be dropped off at certain locations in order to unlock special at any point in the game.

In the instance where you start a new game with a previously played character (not a New Game+, but a New Game w/ Chapter Select) any previously collected skulls (like items) will be lost. You will need to locate both the skull and its altar to receive your developer blueprint.

It is important to note that they will not appear in your inventory as an item that can be traded or sold, so if the skull is not at the location listed, you probably already picked it up without realizing it.